
  In ReadBuffer, do not set the username is already set.
  Fixes a problem when retrieving files from workers where the username is different,
  e.g. PoD on gLite.


git-svn-id: acec3fd5b7ea1eb9e79d6329d318e8118ee2e14f@43440 27541ba8-7e3a-0410-8455-c3a389f83636

bbockelm/root-historical,bbockelm/root-historical,bbockelm/root-historical,bbockelm/root-historical,bbockelm/root-historical,bbockelm/root-historical,bbockelm/root-historical